<p>The authors attempt to formalize some properties which any reasonable control-flow complexity measure must satisfy. Since large programs are often built by sequencing and nesting of simpler constructs, the authors explore how control-flow complexity measures behave under such compositions. They analyze five existing control flow complexity measures-cyclomatic number, total adjusted complexity, scope ratio, MEBOW, and NPATH. The analysis reveals the strengths and weaknesses of these control flow complexity measures.</p>